We found 15 dictionaries that define the word opposite sex:

General (10 matching dictionaries)

1. opposite sex, the opposite sex: Merriam-Webster
2. opposite sex: Oxford Learner's Dictionaries
3. opposite sex, the opposite sex: Collins English Dictionary
4. opposite-sex: Wordnik
5. the opposite sex: Cambridge Advanced Learner's Dictionary
6. opposite sex: Wiktionary
7. Opposite Sex (TV series), Opposite sex (disambiguation), The Opposite Sex (film), The Opposite Sex: Wikipedia, the Free Encyclopedia
8. opposite sex: TheFreeDictionary.com

Business (1 matching dictionary)

9. Opposite sex: Legal dictionary

Computing (1 matching dictionary)

10. Opposite sex: Encyclopedia

Medicine (1 matching dictionary)

11. opposite sex: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

12. opposite sex: Idioms

Slang (1 matching dictionary)

13. opposite sex: Urban Dictionary

Definitions from Wiktionary (opposite sex) ▸ noun:  Women in relation to men or men in relation to women. ▸ noun:  (attributively) Heterosexual, or otherwise relating to a relationship between a woman and a man. Similar: man and wife, wo/man, womankind, femaledom, womenfolk, womandom, femdom, woman, sister, womyn-born-womyn, more... Opposite: same sex, gay Phrases: The Opposite Sex, The Opposite of Sex, opposite of sex, opposite of sex me, more... ▸ Words similar to opposite sex ▸ Usage examples for opposite sex ▸ Idioms related to opposite sex ▸ Wikipedia articles (New!) ▸ Words that often appear near opposite sex ▸ Rhymes of opposite sex ▸ Invented words related to opposite sex